Question
Which of the following statements is correct?
(a) Centre of the mass of a body always coincides with the centre of gravity of the body.
(b) Centre of the mass of a body is the point at which the total gravitational torque on the body is zero
(c) A couple on a body produce both translational and rotational motion in a body.
(d) Mechanical advantage greater than one means that small effort can be used to lift a large load.
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(b) and (d)
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(a) and (b)
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(b) and (c)
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(c) and (d)
Solution
A.
(b) and (d)
Centre of mass may or may not coincide with centre of gravity.
